Which motor/pinion

[Briguy-01]

I have had a few LCC over the years and don`t remember what I ran for a motor in them .
I will be running 3S and swore I ran 13.5 in the past but not 100% .
21.5 , 17.5 , or 13.5 ? What about gearing ? I do have a 13.5 with a high torque rotor and leaning towards that since it is just sitting in my box .


Looking to have descent grunt but also good wheel speed for the hill climbs at the club`s course .


Thanks

[dentonmac]

Originally Posted by Briguy-01

I have had a few LCC over the years and don`t remember what I ran for a motor in them .
I will be running 3S and swore I ran 13.5 in the past but not 100% .
21.5 , 17.5 , or 13.5 ? What about gearing ? I do have a 13.5 with a high torque rotor and leaning towards that since it is just sitting in my box .


Looking to have descent grunt but also good wheel speed for the hill climbs at the club`s course .


Thanks

Brian,

I bought Losi from you on RCTech on 2011. It came with a Losi 17.5 crawler motor. Cleaned it up and it is still in use today on 3 and 4s, serving me very well. When I ran the LCC tranny, I ran a 13 to 14 pinion. With the LNC tranny I run a 20t pinion. That said, I am crawling not hill climbing. Don't really think hill climbing is the Losi's forte (if I am thinking of what you are talking about).

I have threatened many times to put a 13.5 in there, but if I need the extra punch I just strap in a 4s. IMO much better.

You will get more RPMs out of a 17.5ish on 4s that 13.5 on 3s. Rough numbers, but....

17.5 = 11.1 x 2700 = 29,970
17.5 = 14.8 x 2700 = 39,960
13.5 = 11.1 x 3300 = 36,630

[Briguy-01]

Originally Posted by dentonmac

Brian,

I bought Losi from you on RCTech on 2011. It came with a Losi 17.5 crawler motor. Cleaned it up and it is still in use today on 3 and 4s, serving me very well. When I ran the LCC tranny, I ran a 13 to 14 pinion. With the LNC tranny I run a 20t pinion. That said, I am crawling not hill climbing. Don't really think hill climbing is the Losi's forte (if I am thinking of what you are talking about).

I have threatened many times to put a 13.5 in there, but if I need the extra punch I just strap in a 4s. IMO much better.

You will get more RPMs out of a 17.5ish on 4s that 13.5 on 3s. Rough numbers, but....

17.5 = 11.1 x 2700 = 29,970
17.5 = 14.8 x 2700 = 39,960
13.5 = 11.1 x 3300 = 36,630

Thanks for the reply , think I`ll go with a 17.5 then . What should I gear it for 3S ?

[dentonmac]

Originally Posted by Briguy-01

Thanks for the reply , think I`ll go with a 17.5 then . What should I gear it for 3S ?

LCC or LNC tranny? But it sure won't be a speed demon.

Be looking for HD worms.

[Briguy-01]

Originally Posted by dentonmac

LCC or LNC tranny? But it sure won't be a speed demon.

Be looking for HD worms.

LCC , already have them coming

[dentonmac]

For hill climb I would push as large a pinion as your electronics can handle before you start loosing the bottom end. Start with 17 or 18, still if I am understanding what hill climb is. It will be short bursts, with wheel speed. I would still look to 4s.

What ESC?

[Briguy-01]

I might just leave the hill climb section for my scale rig .


Tekin RS Gen2 , which I`d have to go with something else for 4S .

Still get a lot of grunt with 4S ?

[dentonmac]

Actually, on my gen 1 RS, I put the crawler innovations FXR 4s cap. It runs just fine on 4s. I do not do it very often (14.8 is a lot of juice), but when I need it...I can.

Good call on the scale for hill climb.

And yes, that is one of the other advantages of higher turn with more juice. You get the RPM of a lower turn, but maintain the torque of the higher turn. As well as better low speed resolution, electronics stay cool, longer runtimes, and the punch will shock you. Blah, blah...you get the idea.

In that case, I ran a 13 - 15t pinion.

Look at OlleP Friction thread, good read.

[bryco13]

I don't want to seem to amateur here, but I have a question. I've run quite a few lnc's and lcc's, with different motor configurations. I found that my favorite setup so far was a tekin esc w/ a sensored 17.5 D3 monster hp motor. I've recently been thinking about trying a 13.5 setup in my new build, and was thinking it may be low on torque. My question is with worm gears, does a lower torque motor really mater as much as the driveline is not the conventional setup? I'm not sure if I'm asking the question correctly, just kind of thinking out loud.
-bryan

[Briguy-01]

Originally Posted by bryco13

I don't want to seem to amateur here, but I have a question. I've run quite a few lnc's and lcc's, with different motor configurations. I found that my favorite setup so far was a tekin esc w/ a sensored 17.5 D3 monster hp motor. I've recently been thinking about trying a 13.5 setup in my new build, and was thinking it may be low on torque. My question is with worm gears, does a lower torque motor really mater as much as the driveline is not the conventional setup? I'm not sure if I'm asking the question correctly, just kind of thinking out loud.
-bryan

That is a good point and never thought about that . I would think the only difference would be is motor temps . I`m going to try 13.5 first since I have a D3.5 Maxxilla laying around .

[bryco13]

It may also just be me, when I bind up I take a reverse instead of a off course repair. I also find a slow smooth pace is more of my driving style, but the lcc teamed up with a fast motor can produce a good "jump" motion (and of course help get it off its lid). Even with my scalers, I've never run anything slower than a 35t. Just my two cents.

[Olle P]

There are essentially four differences between motor of different winds (when everything else is equal):
1. Torque at the motor axle. (More winds = more torque.) Can be fully compensated by a change in gearing.
2. Motor speed. (More winds = less speed.) The difference goes down when torque is applied, and vehicle speed doesn't differ nearly as much with proper gearing.
3. Motor power. (More winds = less power.) At proper gearing a lower wind motor can generate a higher maximum wheel speed.
4. Motor efficiency. (More winds = more efficiency.) A high wind motor will use less electrical power and run cooler at a given output power.

The result is that for a given voltage feed lower wind motors can deliver more power at the cost of more heat and less run time.
If more power is desirable it's better to increase the voltage.

[murlin12]

This is kinda a dumb question....the pinion gear is the gear that is conected to the motor right? So if I was wanting to keep the stock tranny, what would be the best motor and gearing configuration for good torque and speed.....but more than likley ill just have to see for myself.

[dentonmac]

Originally Posted by murlin12

This is kinda a dumb question....the pinion gear is the gear that is conected to the motor right? So if I was wanting to keep the stock tranny, what would be the best motor and gearing configuration for good torque and speed.....but more than likley ill just have to see for myself.

Not a dumb question just open-ended. I'll answer for crawling (since that is what I know), a different discipline will be different.

Motor - I would suggest the Novak 18.5 crawler with the MMP on 3s or 4s.

LCC tranny - 14-16 tooth pinion, depending on how friction-free your drivetrain is.
LNC tranny - Have had great success right at 20t pinion.

Hope it helps.

[Olle P]

I agree with Dentonmac, apart from the choice of motor.
My pick is Holmes Hobbies' Revolver S 540.
Compared to Novak's motor the Revolver is:
- Lighter (150g with wires vs 187g without wires.)
- Smoother (14 poles vs 2)
- Stronger (a bit more torque)
- Faster (2,000 Kv vs 1,650 Kv)
- No built-in timing. (The Novak motor is set at 15 degrees, IIRC.)
- Cheaper, I think.

[Briguy-01]

I ended up putting in the only motor I had which was a Trinity D3.5 13.5 Maxilla with 15T pinion . Had really good torque and awesome wheel speed when needed while remaining cool as a cucumber .


Going to bring the gearing down a few teeth to see if/what changes next Sunday . Just need to pickup a stronger servo and should be good to go .

[Olle P]

That motor should work. Just don't run it too long on 4S.

Originally Posted by Briguy-01

Going to bring the gearing down a few teeth to see if/what changes...

You can expect to see a little smoother operation at minimum speed, possibly at some loss of top speed.

As you noticed motor heat isn't a problem, but worm drive heat might be.
Check the temperature by touching the pinion ends (where the drive shafts are attached).

[Liv3mind]

im running 18.5/20t and 2s/3s, good torque and good wheelspeed